If you understand what it really means when someone on reddit accuses you of being a "Russian Bot" or any related variant, you also understand that you have no reason to be embarrassed about it. Their stupidity is unfortunate, but it's no fault of yours. In fact, it's likely that you even tried to patiently correct them, and they not only refused the correction, but became hostile that it was even offered. At that point, you've actually gone above and beyond anything expected of a decent human being. So what would there be to be embarrassed about?